这些附加例程只用于中断模拟。
These extra routines are required only for this interrupt simulation.
当中断模拟早已运行时，就会出现这种情况。
This scenario arises when interrupt simulation is already in progress.
设置中断模拟状态标志，通知中断模拟正在运行。
Set the interrupt simulation status flag to indicate that interrupt simulation is in progress.
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